Mack vs Rex

Baby Name Comparison — 2026

Mack

Boy #499 Most Popular 1 Syllable

"son of"

Origin: Scottish Gaelic

Scottish Irish American

✓ All Clear

Boy #793 Most Popular 1 Syllable

"king"

Origin: Latin

English Latin American

✓ All Clear

Mack Rank #499

Rex Rank #793

Mack is more popular, ranked #499 vs #793 for Rex.

Is Mack or Rex more popular?

Mack is more popular, ranked #499 compared to Rex at #793 in the United States.

What do Mack and Rex mean?

Mack means "son of" (Scottish Gaelic origin). Rex means "king" (Latin origin).

Are Mack and Rex boy or girl names?

Mack is primarily a boy name. Rex is primarily a boy name.